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• W2110851539 startingPage "3879" @default.
• W2110851539 abstract "On a multiantenna broadcast channel, simultaneous transmission to multiple users by joint beamforming and scheduling is capable of achieving high throughput, which grows double logarithmically with the number of users. The sum rate for channel state information (CSI) feedback, however, increases linearly with the number of users, reducing the effective uplink capacity. To address this problem, a novel space division multiple access (SDMA) design is proposed, where the sum feedback rate is upper bounded by a constant. This design consists of algorithms for CSI quantization, threshold-based CSI feedback, and joint beamforming and scheduling. The key feature of the proposed approach is the use of feedback thresholds to select feedback users with large channel gains and small CSI quantization errors such that the sum feedback rate constraint is satisfied. Despite this constraint, the proposed SDMA design is shown to achieve a sum capacity growth rate close to the optimal one. Moreover, the feedback overflow probability for this design is found to decrease exponentially with the difference between the allowable and the average sum feedback rates. Numerical results show that the proposed SDMA design is capable of attaining higher sum capacities than existing ones, even though the sum feedback rate is bounded." @default.
• W2110851539 created "2016-06-24" @default.
• W2110851539 creator A5007131492 @default.
• W2110851539 creator A5029812222 @default.
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• W2110851539 date "2007-07-01" @default.
• W2110851539 modified "2023-10-09" @default.
• W2110851539 title "Space Division Multiple Access With a Sum Feedback Rate Constraint" @default.
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• W2110851539 doi "https://doi.org/10.1109/tsp.2007.894245" @default.
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